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Trees Provide Shade to Retain Moisture In Ground Vegetation

urban forests in San Francisco can lower temperatures by 15F

doc-titleThe influence of urban park characteristics on ant (Hymenoptera, Formicidae) communities
quoteIn San Francisco, shade from the tree canopy compounded by coastal fog during the summer can reduce forest temperatures by as much as 15ओ(F) in some areas of the city during the day (Gilliam 1962).
sourceClarke, Fisher, and LeBuhn in Urban Ecosystems